Over the past decade, Steven D. Levitt and Stephen J. Dubner have published more than 8,000 blog posts on Freakonomics.com. Many of them, they freely admit, were rubbish. But now they’ve gone through and picked the best of the best. You’ll discover what people lie about, and why; the best way to cut gun deaths; why it might be time for a sex tax; and, yes, when to rob a bank. (Short answer: never; the ROI is terrible.) You’ll also learn a great deal about Levitt and Dubner’s own quirks and passions, from gambling and golf to backgammon and the abolition of the penny.

Steven Levitt and Stephen Dubner, the co-authors of the immensely popular Freakonomics, are back with their third book in the series: Think Like a Freak. In it, rather than discussing what they think, they talk about how they think.

Levitt and Dubner offer a blueprint for an entirely new way to solve problems, whether your interest lies in minor lifehacks or major global reforms. As always, no topic is off-limits. They range from business to philanthropy to sports to politics, all with the goal of retraining your brain. Along the way, you’ll learn the secrets of a Japanese hot-dog-eating champion, the reason an Australian doctor swallowed a batch of dangerous bacteria, and why Nigerian e-mail scammers make a point of saying they’re from Nigeria.

Given their emphasis on cold, hard numbers, it’s noteworthy that Levitt and Dubner ignore what are, by now, whole libraries’ worth of data on global warming. Indeed, just about everything they have to say on the topic is, factually speaking, wrong. Among the many matters they misrepresent are: the significance of carbon emissions as a climate-forcing agent, the mechanics of climate modelling, the temperature record of the past decade, and the climate history of the past several hundred thousand years.

The key factor separating geniuses from the merely accomplished is not a divine spark. It’s not I.Q., a generally bad predictor of success, even in realms like chess. Instead, it’s deliberate practice. Top performers spend more hours (many more hours) rigorously practicing their craft.

Athletes have long been ridiculed for the cliches they use when talking about how they won, particularly during post-game interviews. You know them by heart:

We just have to keep working hard.
It just comes down to staying focused.
We gave it 110% tonight.
We worked hard in practice all week.
We never gave up.

If the writers above (and the researchers their writings are based on) are correct, maybe the jocks have it right: it all comes down to preparation, working harder, and wanting it more than the other guy. Simple…except for that pesky 10,000 hours thing.

Dr. Levitt was kind enough to answer a few questions I had about the book:

jkottke: In Freakonomics, you state that you’re interested in applying economic tools to “more interesting” subjects than what one may have learned about in my high school economics class. What’s your definition of economics? Is it a tool set or a science or what?

Steven Levitt: I think of economics as a worldview, not a set of topics. This worldview has a few different pieces. First, incentives are paramount. If you understand someone’s incentives, you can do a pretty good job of predicting their behavior. Second, the appropriate data, analyzed the right way are key to understanding a problem. Finally, political correctness is irrelevant. Whatever the answer happens to be, whether you think it will be popular or not, that is the answer you put forth.

jkottke: Your talent for ignoring seemingly applicable but ultimately irrelevant information (not that different from a professional-grade batter taking cues from certain aspects of a pitcher’s mechanics and ignoring the extraneous ones in order to hit well), where does that come from? Good genes or was it all the books in your childhood home?

Levitt: If nothing else, I had an unusual home environment. My father is a medical researcher whose claim to fame is that he is the world’s expert on intestinal gas (he’s known as the King of Farts). My mother is a psychic who channels books. From an early age, my life was different from that of other kids. For instance, when I was in junior high, my father would wake me up at night to drill me with questions in hopes that I would be the star of the local high school quiz show.

jkottke: In looking at the world through data, you’ve investigated cheating schoolteachers, falling crime rates due to abortion, and the parallels between McDonald’s corporate structure and the inner workings of a crack-dealing gang. What’s the oddest or most surprising thing you’ve uncovered with this approach? Maybe something you still can’t quite believe or explain?

Levitt: It’s not the oddest result I’ve ever come up with, but there is one finding I have always puzzled over: when cities hire lots of Black cops, the arrest rates of Whites go up, but no more Blacks get arrested. When cities hire White cops, the opposite happens (more Black arrests, no more White arrests). It was an amazingly stark result, but I’m not quite sure what the right story is.

jkottke: In the chapter on the effect of abortion on crime rates, you and Stephen take care emphasizing what the data says and the strong views that people in the US hold on the issue of abortion. Still, if someone wants to twist your observations into something like “abortion is good because it lowers crime”, it’s not that difficult. Have your observations in this area caused any problems for you? Any extreme reactions?

Levitt: I have gotten a whole lot of hate mail on the abortion issue (as much from the left as from the right, amazingly). What I try to tell anyone who will listen — few people will listen when the subject is abortion — is that our findings on abortion and crime have almost nothing to say about public policy on abortion. If abortion is murder as pro-life advocates say, then a few thousand less homicides is nothing compared to abortion itself. If a woman’s right to choose is sacrosanct, then utilitarian arguments are inconsequential. Mainly, I think the results on abortion imply that we should do the best we can to try to make sure kids who are born are wanted and loved. And it turns out that is something just about everyone can agree on.

jkottke: In the book, you say “a slight tweak [in incentives] can produce drastic and unforseen results”. If you were the omnipotent leader of the US for a short time, what little tweak might you make to our political, cultural, or economic frameworks to make America better (if you can forgive the subjectivity of that word)?

Levitt: I would start by increasing the IRS budget ten-fold and doing a lot more tax audits. If everyone paid their taxes, tax rates could be much lower and otherwise honest people wouldn’t be tempted to cheat. For some reason, everyone hates the idea. But we can’t all be cheating more than average on our taxes. I think it would be for the better. And after I got done with that, I’d legalize sports betting, and I would also do away with most of the nonsense and hassle that currently goes into airport security.

jkottke: In the war between the film and music industries and their customers, there’s an argument over how much the explosive increase in Internet piracy affects sales of CDs, movie tickets, and DVDs. Using the same data, the music/movie industry argues that sales are down because of piracy (or at least diminished from what they “should” be in a piracy-free marketplace) while the other side argues that sales are up and that piracy may actually have a beneficial effect. The question of “how does piracy affect record/movie sales?” seems well suited to your particular application of economic tools. Have you looked at this question? And if not, do you have sense of which special view of the data might reveal an answer?

Levitt: I have not myself studied the issue. I have a former student who has studied this issue. Alejandro Zentner. He argues that music sales are way down as a consequence of downloading. He uses the availability/price of high-speed internet across areas and relates that to patterns of self-reported music buying.